沉积盆地地温梯度研究中应注意的问题  

Some Remarks about Geothermal Gradient of Sedimentary Basins

作　　者：袁玉松[1,2] 米立军[3] 张功成[3] 郑和荣[1] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国地质大学(北京),北京100083 [3]中国海洋石油总公司,北京100010

出　　处：《地质论评》2009年第4期531-535,共5页Geological Review

基　　金：国家重点基础项目973(编号2009CB219400);国家科技重大专项(编号2008ZX05005);石油化工联合基金(编号40739904)资助的成果

摘　　要：沉积盆地的地温场特征是油气勘探研究的重要内容之一。油气勘探工作者习惯于采用地温梯度而不是大地热流来描述沉积盆地的热状态,但是,地温梯度与计算井段密切相关,离开计算井段去谈地温梯度高低,很容易引起误解,尤其是在测温井段较短或测温深度较浅时,测温数据不能直接用于计算沉积盆地的地温梯度,否则,会得出错误的结论。然而,在实际研究工作中,这一点经常被忽视。为此,本文提出了"规一化"地温梯度的概念和计算方法,并以实例说明沉积盆地地温场研究中,采用"规一化"地温梯度来描述盆地热状态平面分布特征的必要性。Geothermal survey is an important tool in petroleum exploration. Among the geothermal parameters, the geothermal gradient is more often used by petroleum geologist because the hydrocarbon generation of source rocks is directly associated with temperature. However, the measured geothermal gradient data originated from diverse depth range, make spatial comparison a challenging task. In the conventional study of geothermal field of sedimentary basins unfortunately, the fact that geothermal gradient is depth-dependant is often ignored. A ＂uniform＂ geothermal gradient method is brought forward in this paper and a case study is carried out in order to demonstrate the necessity of this method in studying the spatial distribution of geothermal gradient of sedimentary basins.

关 键 词：沉积盆地 “规-化”地温梯度 大地热流 地温场 

分 类 号：P618.13[天文地球—矿床学]